Spikes Tactical Gas Block .308 Micro .750 w/Two Set Screws. Specifications for Spikes Tactical ST .308 Micro Gas Block: Manufacturer: Spikes Tactical Coating: Black Nitride Fabric/Material: Solid Billet Steel Size: .750 Gun Model: AR-10 Weight: 1.9 oz Additional Features: w/Two Set Screws Condition: New Country of Origin: USA Features of Spikes Tactical ST .308 Micro Gas Block: Low Profile Gas Block Solid Billet Steel .750 I.D. Black Nitride Coating Weight: 1.9oz Package Contents: Spikes Tactical ST .308 Micro Gas Block What firearm models does the manufacturer say Spikes Tactical ST .308 Micro Gas Block is compatible with? The manufacturer says that Spikes Tactical ST .308 Micro Gas Block is compatible with AR-10Spikes Tactical SUGBX20: Gas Block .308 Micro .750 w/Two Set Screws